ASTHA K-3 Plus is a non-contact wall-mounted thermometer than can be used in multiple settings. It can be easily switched between Fahrenheit and Celsius by clicking the "mode" button. Rapid results in 0.5 seconds and highly accurate with +/- 0.2 degrees. Audio alarm along with colored flashing lights makes temperature readings easy to understand. Easily mountable and can also be placed on a tripod. Two different power sources (USB cable or 18650 battery) make any mounting location easy. Ideal for business entrances, restaurants, offices, apartments, homes, shops, and other high-traffic areas. Wall-Mounted K3 Plus Digital Infrared Thermometer Non-Contact Body Thermometer LCD Display Office Metro the Mall Use.